患者女，30岁。因十二指肠球部溃疡而行手术治疗，术后出现十二指肠瘘，给予禁食、胃肠减压、瘘液外引流及静脉营养等治疗，5d后患者出现嗜睡、呼吸改变，血压下降。

患者出现上述症状的原因是（）

A.低渗性脱水

B.代谢性酸中毒

C.呼吸性酸中毒

D.代谢性碱中毒

E.CO₂结合力升高

To a router, a flow is a (1) of packets that share the same characterstics, such as traveling the same (2) , using the same (3) , having the same kind of security, and so on. A router that suppors the handling of flow labels has a (4) table. The table has an entry for each active flow label; each entry defines the (5) required by the corresponding flow label.

4（）

A．flow table

B．flow label

C．rout table

D．tag table